The slave ship Marthe left the African coast carrying enslaved Africans toward Haiti. About 415 people had been taken aboard.

Vessel: Marthe; flag: France. People recorded in connection with the voyage: Captain: Bassac, J; Investor: Bassac, J; Investor: Allegre; Captain: Lamoisse, J-B. The voyage began at Le Havre on 9 April 1785. Principal recorded place where captives were acquired: West Central Africa and St Helena, port unspecified. Principal recorded disembarkation place: Port-au-Prince. Recorded duration of the captives' Atlantic crossing: 79 days. Estimated mortality during the crossing: 1.0%. Recorded outcome: Voyage completed as intended.